Quantitative Analysis: Master the Techniques for Accurate Sample Analysis

Question 1

Which procedure is NOT employed in gravimetric analysis?

Accepted Answer

Titration

Answer

Sample preparation

Answer

Precipitation

Answer

Filtration

Question 2

In volumetric analysis, what is the primary purpose of performing a blank titration?

Accepted Answer

To account for impurities and reaction interferences

Answer

To determine the analyte's concentration

Answer

To regulate the pH of the solution

Answer

To calibrate the buret

Question 3

In a titration, what does the equivalence point represent?

Accepted Answer

The point where moles of titrant added equal moles of analyte

Answer

The point where the solution reaches neutrality

Answer

The point where the indicator changes color

Answer

The point where the reaction is complete

Question 4

For quantitative trace element determination, which instrumental method is commonly employed?

Accepted Answer

Atomic absorption spectroscopy

Answer

Gas chromatography

Answer

High-performance liquid chromatography

Answer

X-ray diffraction

Question 5

What is the fundamental principle underlying gravimetric analysis?

Accepted Answer

Converting the analyte into a compound with known composition and mass

Answer

Analyzing the analyte using spectroscopy

Answer

Separating the analyte chromatographically

Answer

Measuring the analyte electrochemically

Question 6

In a titration, what is the function of an indicator?

Accepted Answer

To signal the titration's endpoint

Answer

To calibrate the buret

Answer

To adjust the pH of the solution

Answer

To prevent the formation of precipitates

Question 7

In quantitative analysis, how are precision and accuracy distinct from one another?

Accepted Answer

Precision measures replicate measurement closeness, while accuracy measures proximity to true value.

Answer

Accuracy measures replicate measurement closeness, while precision measures proximity to true value.

Answer

Precision and accuracy are identical concepts.

Answer

Accuracy represents a range of values likely to contain the true value, while precision measures measurement variation.

Question 8

In gravimetric analysis, the precipitate is formed when:

Accepted Answer

A. The analyte reacts with a precipitating reagent

Answer

B. A solution is evaporated to dryness

Answer

C. A gas is bubbled through a solution

Answer

D. A solid is dissolved in a solvent

Question 9

In a redox titration, the equivalence point is achieved when:

Accepted Answer

A. The moles of electrons lost by the reducing agent equal the moles of electrons gained by the oxidizing agent

Answer

B. The pH of the solution is 7

Answer

C. The solution turns a specific color

Answer

D. A precipitate forms

Question 10

In the context of quantitative analysis, which term describes the ability of a method to differentiate between different analytes?

Accepted Answer

C. Selectivity

Answer

A. Precision

Answer

B. Sensitivity

Answer

D. Accuracy

Question 11

In quantitative analysis, which factor is of paramount importance when establishing quality control measures?

Accepted Answer

Accuracy and precision

Answer

Cost-effectiveness

Answer

Sample volume

Answer

Equipment availability

Question 12

What is the primary objective of quantitative analysis?

Accepted Answer

To determine the concentration or amount of specific analytes in a sample

Answer

To identify the components of a sample

Answer

To separate the components of a sample

Answer

To purify the components of a sample

Question 13

Differentiate between gravimetric and volumetric analysis?

Accepted Answer

Gravimetric analysis measures mass, while volumetric analysis measures volume.

Answer

Volumetric analysis measures mass, while gravimetric analysis measures volume.

Answer

Gravimetric analysis is used for solids, while volumetric analysis is used for liquids.

Answer

Volumetric analysis is used for solids, while gravimetric analysis is used for liquids.

Question 14

What is the primary purpose of a titration?

Accepted Answer

To determine the concentration of an unknown analyte

Answer

To separate the components of a mixture

Answer

To purify a compound

Answer

To identify the components of a sample

Question 15

Which type of instrumental method is employed to measure the absorption of light by a sample?

Accepted Answer

Spectrophotometry

Answer

Chromatography

Answer

Mass spectrometry

Answer

Electrochemistry

Question 16

Which of the following is a common type of gravimetric analysis?

Accepted Answer

Precipitation

Answer

Volatilization

Answer

Titration

Answer

Chromatography

Question 17

What is the endpoint of a titration?

Accepted Answer

The point at which the indicator changes color or another predetermined signal is observed

Answer

The point at which the reaction is complete

Answer

The point at which the solution becomes saturated

Answer

The point at which the solution becomes clear

Question 18

Which of the following is NOT a type of volumetric analysis?

Accepted Answer

Gravimetric titration

Answer

Acid-base titration

Answer

Redox titration

Answer

Complexometric titration